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In this case, the anti-freeze and anti-blocking systems are deacti-
vated. Drain the heating and domestic water system if there is any
risk of freezing.
Position
position
3.25 Keypad lock function
Press buttons 1+3 for at least 2 seconds to activate the keypad
lock; press them again for at least 2 seconds to deactivate the lock.
The display shows the sliding string LOCK.
+
1
1
Button 2 may remain active if there is a fault, so the alarm can be
reset.
3.26 Alarm log
The alarm log is active with parameter P7.01=1 (SERVICE).
The alarms can be visualised:
- in the INFO menu (from I039 to I043), in chronological order from
the most recent to the oldest, up to a maximum of 5 after 2 hours
of operation
- on the OT+ remote control (if connected and supported)
If an alarm occurs several times consecutively, it is saved only once.
To reset the alarm, follow the indications given in paragraph "3.11
Reset function".
+
+
RESET
MENU
3
3
+
RESET
MENU
> 2 sec
3.27 Interface standby
If there are no faults or heat requests, the display always shows the
temperature measured by the flow sensor. After 10 seconds with
no heat requests and no buttons pressed, the interface goes into
standby. The display shows the current time, with the two points
separating the hours from the minutes flashing (0.5 sec ON, 0.5
sec OFF). The status icons will be activated if necessary:
3.28 Replacing the interface
System configuration operations must be carried out by profession-
ally qualified Aftersales Service personnel.
If the interface board is replaced, the user may be asked to reset
the time and day values (see paragraph "3.2 Programming the boil-
er") when the power is switched back on. Note that it is not nec-
essary to reprogram the configuration parameters as their values
are retrieved by the adjustment and control board in the boiler. It
may, however, be necessary to reset the DHW and heating set-
point values.
3.29 Replacing the board
If the adjustment and control board is replaced, it may be neces-
sary to reprogram the configuration parameters.
In this case, refer to the parameter table ("1.10 Structure menu")
to see the board default values, the factory-set values, and the
personalised values.
The most important parameters which must be checked and possi-
bly reset when the board is replaced are the following:
P3.01
P3.02
P3.03
P3.06
P3.07
P3.08
P3.09
P5.07
P7.08 (WARNING - set the parameter at 0).
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